Note: this method is only recommended if g-cpan fails to recursively install dependencies that the CPAN shell would otherwise identify.

Installing Padre from the CPAN shell may upgrade core modules provided by the core Gentoo perl install, so be prepared to downgrade those modules when emerging other packages or upgrading the system. A 'force install Padre' afterwards can help upgrade the conflicts again.

Also, one or more of the modules may require perl 5.10. This is not a part of any portage tree as of yet and can only be found in the perl overlay. See ​Gentoo Bug#206455.